/*********************************************************************************
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* Copyright: (C) 2019 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: infrared.c
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* Description: This file
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*
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* pi@raspberrypi:~ $ gpio readall #show BCM and wPi pinmap
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*
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* PIN #PIN BCM wPi
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* VCC(left) ---- 2 ---- 5v ---- 5v
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* I/O(mid) ---- 32 ---- 12 ---- 26
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* GND(right) ---- 34 ---- 0v ---- 0v
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*
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* Version: 1.0.0(30/01/19)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "30/01/19 03:37:16"
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*
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********************************************************************************/
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#include <stdio.h>
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#include <unistd.h>
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#ifdef CONFIG_USE_WIRINGPI
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#include <wiringPi.h>
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#define INFRARED_PIN 26
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int main (int argc, char **argv)
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{
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wiringPiSetup();
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pinMode(INFRARED_PIN, INPUT);
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while(1)
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{
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printf("Infrared monitor: %s\n", digitalRead(INFRARED_PIN)? "Someone is closing!":"No one nearby!");
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sleep(1);
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}
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return 0;
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}
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#else
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#include <gpiod.h>
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#define INFRARED_PIN 12
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int main (int argc, char **argv)
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{
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struct gpiod_chip* chip;
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struct gpiod_line* line;
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int rv = 0;
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struct gpiod_line_event event;
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chip = gpiod_chip_open_by_name("gpiochip0");
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if( !chip )
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{
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printf("gpiod open chip failure, maybe you need running as root\n");
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return 1;
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}
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line = gpiod_chip_get_line(chip, INFRARED_PIN);
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if( !line )
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{
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printf("gpiod get line[%d] failure\n", INFRARED_PIN);
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rv = 2;
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goto cleanup;
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}
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if( gpiod_line_request_rising_edge_events(line, "infrared") < 0 )
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{
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printf("gpiod request rising edge event failure\n");
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rv = 3;
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goto cleanup;
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}
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while(1)
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{
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/* This function will block, must call it to setup */
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if( gpiod_line_event_wait(line, NULL) < 0 )
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{
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printf("gpiod line wait event failure!\n");
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}
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/* This function will block, must read to clear the event */
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if (gpiod_line_event_read(line, &event) < 0)
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{
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printf("gpiod line wait event failure!\n");
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}
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if (event.event_type == GPIOD_LINE_EVENT_RISING_EDGE)
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{
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printf("Infrared monitor: Someone is closing!\n");
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}
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}
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cleanup:
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gpiod_chip_close(chip);
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return rv;
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}
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#endif
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